LSM303DLH Datasheet, PDF (31/47 Pages) STMicroelectronics – Sensor module: 3-axis accelerometer and 3-axis magnetometer

LSM303DLH
Registers description
internal registers related to trimming functions to permit good device behavior. If, for any
reason, the content of the trimming registers was changed, it is sufficient to use this bit to
restore the correct values. When the BOOT bit is set to ‘1’ the content of internal Flash is
copied to the corresponding internal registers and is used to calibrate the device. These
values are factory-trimmed and are different for every accelerometer. They permit good
device behavior and normally do not have to be modified. At the end of the boot process, the
BOOT bit is again set to ‘0’.
Table 24. High-pass filter mode configuration
HPM1
HPM0
High-pass filter mode
0
0
Normal mode (reset reading HP_RESET_FILTER)
0
1
Reference signal for filtering
1
0
Normal mode (reset reading HP_RESET_FILTER)
9.1.3
HPCF[1:0]. These bits are used to configure the high-pass filter cut-off frequency f_t,which is
given by:
f_t =
ln _⎝⎛1 – _H-----^1P-----_c-_⎠⎞ ⋅
--^f--^s--
2π
The equation can be simplified to the following approximated equation:
f_t
=
----------^f--^s----------
6 ⋅ HPc
Table 25. High-pass filter cut-off frequency configuration
HPcoeff2,1
f_t [Hz]
f_t [Hz]
f_t [Hz]
f_t [Hz]
Data rate = 50 Hz Data rate = 100 Hz Data rate = 400 Hz Data rate = 1000 Hz
00
1
2
8
20
01
0.5
1
4
10
10
0.25
0.5
2
5
11
0.125
0.25
1
2.5
CTRL_REG3_A (22h)
Table 26. CTRL_REG3_A register
IHL
PP_OD
LIR2 I2_CFG1 I2_CFG0
LIR1
I1_CFG1 I1_CFG0
Doc ID 16941 Rev 1
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